本文主要研究内容
作者李艳秋（2019）在《偶氮苯衍生物增强石墨烯光学非线性及机理研究》一文中研究指出：石墨烯是一种由碳原子以sp2杂化轨道组成呈六角型蜂巢状晶格的二维材料,具有优异的光学、电学、力学特性,在材料学、微纳米加工、能源、生物医学和药物传递等方面具有重要的应用前景,被认为是一种未来革命性的材料。由于其零带隙的线性分子色散、较高的电子迁移速率和宽带吸收特性,使它成为一种良好的非线性光学吸收材料,可被用于非线性光学器件领域。然而,石墨烯自身的光学性质还存在一定的不足,如:饱和吸收系数还比较小、光响应速率较慢、性质不太稳定等。为了进一步提高基于石墨烯材料和器件的非线性光学性质和响应特性,近年来,石墨烯复合材料的构建和增强非线性光学效应受到了人们广泛的关注,并已经成为非线性光学研究领域的一个热点。本论文主要利用非共价键功能化（π-π堆积作用和氢键作用）石墨烯,制备了两种偶氮苯衍生物（AOB-t8,BNB-t8）/还原氧化石墨烯（RGO）复合材料（AOB-t8/RGO,BNB-t8/RGO）。通过X射线衍射、傅立叶变换红外光谱、拉曼光谱、紫外可见吸收光谱、透射电子显微镜、稳态荧光光谱等技术对样品的结构、形貌和基本性能等进行了表征。利用飞秒Z扫描技术对它们的非线性光学性质进行测试,发现与单纯的还原氧化石墨烯RGO相比,两种复合材料的非线性吸收都有一定程度的增强,其中AOB-t8/RGO的饱和吸收系数增强了2.7倍,BNB-t8/RGO的增强可达38.6倍;利用飞秒瞬态吸收光谱技术对BNB-t8/RGO的非线性增强机理进行了深入研究。具体研究内容和结果如下:1.以氧化石墨烯GO和偶氮苯衍生物AOB-t8（含恶二唑基团）为原料,硼氢化钠NaBH4为还原剂,运用溶剂热法制备石墨烯RGO与AOB-t8/RGO复合物材料。通过拉曼光谱、傅立叶变换红外光谱和紫外可见吸收光谱等手段对复合材料进行了表征。结果表明,AOB-t8/RGO的复合,主要通过AOB-t8与RGO之间的π-π堆积作用而实现。之后,利用飞秒Z扫描技术对复合材料的非线性光学性质进行了测试,结果发现:与单纯的RGO相比,AOB-t8/RGO复合材料的三阶非线性吸收和折射都有一定程度的增强,AOB-t8/RGO的非线性吸收系数和非线性折射率与RGO相比分别增强了2.7倍和2.4倍。增强的主要机制可归结于AOB-t8的恶二唑和芳香环基团与RGO的π-π堆积作用,而AOB-t8与RGO之间较强的π-π相互作用增大了RGO的π-电子离域性,促进了AOB-t8与RGO之间的电荷转移。2.基于AOB-t8与RGO复合的结果,推测分子间作用力（氢键作用）的不同可能会对复合材料的复合程度及非线性光学性质有着重要影响。为此,我们以BNB-t8（含酰胺基团）为原料,制备了RGO与BNB-t8的复合材料BNB-t8/RGO,并通过改变底物GO和BNB-t8的质量比来制备和优化BNB-t8与RGO的复合效果。通过拉曼光谱、X射线衍射、傅里叶变换红外光谱、紫外可见吸收光谱以及稳态荧光光谱等技术对所获得的复合材料进行了表征。结果表明:RGO和BNB-t8之间具有更强的相互作用并存在电子转移,吸收光谱上表现为在520 nm附近出现了一个新的更强的复合体吸收带;相对于单独的RGO,复合材料BNB-t8/RGO的缺陷增多、结晶度降低、层间距增大;BNB-t8与RGO通过π-π堆积作用和氢键作用结合,且BNB-t8可提供较多的氢键结合位点（-C=O和-NH基团）;当BNB-t8的反应质量为80%时,BNB-t8与RGO的结合达到饱和。3.利用Z扫描技术和飞秒瞬态吸收技术对BNB-t8/RGO复合材料的非线性光学性质和机制进行了研究,结果表明:在532 nm工作波长处,单独的BNB-t8表现为双光子吸收特性,而单独的RGO表现为较弱的饱和吸收性质;随着BNB-t8含量的增加,BNB-t8/RGO的非线性吸收系数逐渐增大,当BNB-t8的含量为80%时,复合材料的非线性饱和吸收系数约是RGO的38.3倍;复合材料的非线性光学吸收特性表现出一定的波长依赖关系。非线性吸收增强的主要机理归属于RGO到BNB-t8的电荷转移,复合材料在光激发下的电荷分离过程发生在0.28 ps时域,而电荷复合过程则在2.0 ps完成。本论文利用两种偶氮苯衍生物分子与RGO复合,实现了对RGO非线性光学性质的增强。与单纯的RGO和AOB-t8/RGO复合材料相比,BNB-t8/RGO复合材料的非线性吸收特性有了大幅度的增强,主要原因可归结于BNB-t8与RGO之间更强的氢键作用更有利于二者形成复合结构,从而增加电子的离域性;相较于AOB-t8与RGO之间较弱的π-π堆积作用,BNB-t8与RGO之间更强的氢键作用极大地提高了BNB-t8与RGO之间的电荷转移速率和响应速率,显著地提高了BNB-t8/RGO复合材料的非线性光学性质和光响应特性。本论文的结果对设计和构建新型石墨烯复合材料及提高其非线性光学性质具有一定的科学意义。
Abstract
dan mo xi shi yi chong you tan yuan zi yi sp2za hua gui dao zu cheng cheng liu jiao xing feng chao zhuang jing ge de er wei cai liao ,ju you you yi de guang xue 、dian xue 、li xue te xing ,zai cai liao xue 、wei na mi jia gong 、neng yuan 、sheng wu yi xue he yao wu chuan di deng fang mian ju you chong yao de ying yong qian jing ,bei ren wei shi yi chong wei lai ge ming xing de cai liao 。you yu ji ling dai xi de xian xing fen zi se san 、jiao gao de dian zi qian yi su lv he kuan dai xi shou te xing ,shi ta cheng wei yi chong liang hao de fei xian xing guang xue xi shou cai liao ,ke bei yong yu fei xian xing guang xue qi jian ling yu 。ran er ,dan mo xi zi shen de guang xue xing zhi hai cun zai yi ding de bu zu ,ru :bao he xi shou ji shu hai bi jiao xiao 、guang xiang ying su lv jiao man 、xing zhi bu tai wen ding deng 。wei le jin yi bu di gao ji yu dan mo xi cai liao he qi jian de fei xian xing guang xue xing zhi he xiang ying te xing ,jin nian lai ,dan mo xi fu ge cai liao de gou jian he zeng jiang fei xian xing guang xue xiao ying shou dao le ren men an fan de guan zhu ,bing yi jing cheng wei fei xian xing guang xue yan jiu ling yu de yi ge re dian 。ben lun wen zhu yao li yong fei gong jia jian gong neng hua （π-πdui ji zuo yong he qing jian zuo yong ）dan mo xi ,zhi bei le liang chong ou dan ben yan sheng wu （AOB-t8,BNB-t8）/hai yuan yang hua dan mo xi （RGO）fu ge cai liao （AOB-t8/RGO,BNB-t8/RGO）。tong guo Xshe xian yan she 、fu li xie bian huan gong wai guang pu 、la man guang pu 、zi wai ke jian xi shou guang pu 、tou she dian zi xian wei jing 、wen tai ying guang guang pu deng ji shu dui yang pin de jie gou 、xing mao he ji ben xing neng deng jin hang le biao zheng 。li yong fei miao Zsao miao ji shu dui ta men de fei xian xing guang xue xing zhi jin hang ce shi ,fa xian yu chan chun de hai yuan yang hua dan mo xi RGOxiang bi ,liang chong fu ge cai liao de fei xian xing xi shou dou you yi ding cheng du de zeng jiang ,ji zhong AOB-t8/RGOde bao he xi shou ji shu zeng jiang le 2.7bei ,BNB-t8/RGOde zeng jiang ke da 38.6bei ;li yong fei miao shun tai xi shou guang pu ji shu dui BNB-t8/RGOde fei xian xing zeng jiang ji li jin hang le shen ru yan jiu 。ju ti yan jiu nei rong he jie guo ru xia :1.yi yang hua dan mo xi GOhe ou dan ben yan sheng wu AOB-t8（han e er zuo ji tuan ）wei yuan liao ,peng qing hua na NaBH4wei hai yuan ji ,yun yong rong ji re fa zhi bei dan mo xi RGOyu AOB-t8/RGOfu ge wu cai liao 。tong guo la man guang pu 、fu li xie bian huan gong wai guang pu he zi wai ke jian xi shou guang pu deng shou duan dui fu ge cai liao jin hang le biao zheng 。jie guo biao ming ,AOB-t8/RGOde fu ge ,zhu yao tong guo AOB-t8yu RGOzhi jian de π-πdui ji zuo yong er shi xian 。zhi hou ,li yong fei miao Zsao miao ji shu dui fu ge cai liao de fei xian xing guang xue xing zhi jin hang le ce shi ,jie guo fa xian :yu chan chun de RGOxiang bi ,AOB-t8/RGOfu ge cai liao de san jie fei xian xing xi shou he she she dou you yi ding cheng du de zeng jiang ,AOB-t8/RGOde fei xian xing xi shou ji shu he fei xian xing she she lv yu RGOxiang bi fen bie zeng jiang le 2.7bei he 2.4bei 。zeng jiang de zhu yao ji zhi ke gui jie yu AOB-t8de e er zuo he fang xiang huan ji tuan yu RGOde π-πdui ji zuo yong ,er AOB-t8yu RGOzhi jian jiao jiang de π-πxiang hu zuo yong zeng da le RGOde π-dian zi li yu xing ,cu jin le AOB-t8yu RGOzhi jian de dian he zhuai yi 。2.ji yu AOB-t8yu RGOfu ge de jie guo ,tui ce fen zi jian zuo yong li （qing jian zuo yong ）de bu tong ke neng hui dui fu ge cai liao de fu ge cheng du ji fei xian xing guang xue xing zhi you zhao chong yao ying xiang 。wei ci ,wo men yi BNB-t8（han xian an ji tuan ）wei yuan liao ,zhi bei le RGOyu BNB-t8de fu ge cai liao BNB-t8/RGO,bing tong guo gai bian de wu GOhe BNB-t8de zhi liang bi lai zhi bei he you hua BNB-t8yu RGOde fu ge xiao guo 。tong guo la man guang pu 、Xshe xian yan she 、fu li xie bian huan gong wai guang pu 、zi wai ke jian xi shou guang pu yi ji wen tai ying guang guang pu deng ji shu dui suo huo de de fu ge cai liao jin hang le biao zheng 。jie guo biao ming :RGOhe BNB-t8zhi jian ju you geng jiang de xiang hu zuo yong bing cun zai dian zi zhuai yi ,xi shou guang pu shang biao xian wei zai 520 nmfu jin chu xian le yi ge xin de geng jiang de fu ge ti xi shou dai ;xiang dui yu chan du de RGO,fu ge cai liao BNB-t8/RGOde que xian zeng duo 、jie jing du jiang di 、ceng jian ju zeng da ;BNB-t8yu RGOtong guo π-πdui ji zuo yong he qing jian zuo yong jie ge ,ju BNB-t8ke di gong jiao duo de qing jian jie ge wei dian （-C=Ohe -NHji tuan ）;dang BNB-t8de fan ying zhi liang wei 80%shi ,BNB-t8yu RGOde jie ge da dao bao he 。3.li yong Zsao miao ji shu he fei miao shun tai xi shou ji shu dui BNB-t8/RGOfu ge cai liao de fei xian xing guang xue xing zhi he ji zhi jin hang le yan jiu ,jie guo biao ming :zai 532 nmgong zuo bo chang chu ,chan du de BNB-t8biao xian wei shuang guang zi xi shou te xing ,er chan du de RGObiao xian wei jiao ruo de bao he xi shou xing zhi ;sui zhao BNB-t8han liang de zeng jia ,BNB-t8/RGOde fei xian xing xi shou ji shu zhu jian zeng da ,dang BNB-t8de han liang wei 80%shi ,fu ge cai liao de fei xian xing bao he xi shou ji shu yao shi RGOde 38.3bei ;fu ge cai liao de fei xian xing guang xue xi shou te xing biao xian chu yi ding de bo chang yi lai guan ji 。fei xian xing xi shou zeng jiang de zhu yao ji li gui shu yu RGOdao BNB-t8de dian he zhuai yi ,fu ge cai liao zai guang ji fa xia de dian he fen li guo cheng fa sheng zai 0.28 psshi yu ,er dian he fu ge guo cheng ze zai 2.0 pswan cheng 。ben lun wen li yong liang chong ou dan ben yan sheng wu fen zi yu RGOfu ge ,shi xian le dui RGOfei xian xing guang xue xing zhi de zeng jiang 。yu chan chun de RGOhe AOB-t8/RGOfu ge cai liao xiang bi ,BNB-t8/RGOfu ge cai liao de fei xian xing xi shou te xing you le da fu du de zeng jiang ,zhu yao yuan yin ke gui jie yu BNB-t8yu RGOzhi jian geng jiang de qing jian zuo yong geng you li yu er zhe xing cheng fu ge jie gou ,cong er zeng jia dian zi de li yu xing ;xiang jiao yu AOB-t8yu RGOzhi jian jiao ruo de π-πdui ji zuo yong ,BNB-t8yu RGOzhi jian geng jiang de qing jian zuo yong ji da de di gao le BNB-t8yu RGOzhi jian de dian he zhuai yi su lv he xiang ying su lv ,xian zhe de di gao le BNB-t8/RGOfu ge cai liao de fei xian xing guang xue xing zhi he guang xiang ying te xing 。ben lun wen de jie guo dui she ji he gou jian xin xing dan mo xi fu ge cai liao ji di gao ji fei xian xing guang xue xing zhi ju you yi ding de ke xue yi yi 。
论文参考文献
论文详细介绍
论文作者分别是来自河南大学的李艳秋，发表于刊物河南大学2019-09-20论文，是一篇关于石墨烯论文,偶氮苯衍生物论文,饱和吸收论文,三阶非线性论文,电荷转移论文,河南大学2019-09-20论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自河南大学2019-09-20论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：石墨烯论文; 偶氮苯衍生物论文; 饱和吸收论文; 三阶非线性论文; 电荷转移论文; 河南大学2019-09-20论文;